Center for Educational Technologies
Exploring the Environment: Earth System Science
Explains what the four spheres of the Earth are, and the interactions between them.
Other
Big History Project: Chapter 2: Our Solar System and Earth
Interactive resource on the solar system and earth. Engaging site for students and teachers provides a fascinating look at the planetary system. Includes videos, photos, text, quiz.
Rice University
Rice University: Museums Teaching Planet Earth: What Is the Hydrosphere?
Focus is on the hydrosphere and contains the definition as well as characteristics of the ocean and the effect of the ocean on climate.
Smithsonian Institution
Smithsonian Institution: Time and Navigation
Explore navigation methods by sea, air, and space, what latitude and longitude mean, how GPS works, about satellite navigation, and learn about professional navigators. Includes a timeline of developments in navigation from 1280 to the...